JPH06114394A - Water treatment method - Google Patents

Abstract

PURPOSE:To inexpensively and efficiently decompose and remove agricultural chemicals in waste water from a golf course landscape pond or adjusting pond. CONSTITUTION:Usually, pond water 2 is pretreated in a flocculation sedimentation basin 3 and a filter device if necessary and subsequently treated in an ozone treatment device 7 and the treated water 8 is returned to a pond 1 and, when the water level of the pond becomes higher than a reference water level in case of rainy weather, the ozone treated water overflowing from the pond 1 is further treated in an active carbon-adsorbing treatment device 10 and the treated water 11 is discharged out of the golf course.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water treatment method for tap water, sewage, industrial waste water, reservoir water, etc., and more particularly to a water treatment method for golf course pond water.

[0002]

2. Description of the Related Art Conventionally, pesticides such as herbicides, fungicides and insecticides have been sprayed on golf courses as part of lawn management. Some of these pesticides are biodegraded and decomposed by sunlight, but other than that, they are flowing into ponds such as the scenic ponds and regulating ponds in the golf course due to rainfall and watering on the course.

[0003]

However, the water containing the above-mentioned pesticide may flow out of the golf course in rainy weather, and in such a case, the removal of the pesticide in the water is almost considered at the golf course. Since it has not been done and no countermeasures have been taken, it is a problem that very high concentrations of pesticides may occasionally leak.

Therefore, in recent years, "Guidelines for Environmental Agency concerning the concentration of pesticides in wastewater of golf courses" has been established, and it is required to develop a purification technology that satisfies this standard at an early stage and apply it to the golf course.

As a treatment method, it is empirically known that pesticides are surely removed by adsorption of activated carbon, but the running cost of the treatment of activated carbon alone is expensive. The present invention solves the above problems, and an object of the present invention is to decompose and remove pesticides more inexpensively and efficiently.

[0006]

In order to solve the above problems, the present invention provides a water treatment method for pond water, such as a golf course scenic pond or a regulating pond, in which the pond water is usually coagulated and precipitated if necessary. If the pond water level rises above the reference water level, such as when it rains, the ozone-treated water that overflows from the pond is further treated with activated carbon. After the adsorption treatment, the treated water was discharged to the outside of the pond.

[0007]

With the above structure, the pond water is subjected to pretreatment such as coagulation sedimentation and filtration to remove suspended matters and the like, and is subjected to ozone treatment to oxidatively decompose and remove pesticides. The treated water after ozone treatment is returned to the pond again, which helps maintain the landscape. The pesticides that are oxidatively decomposed by ozone treatment are changing to low molecular weight organic compounds with biodegradability modified from the original pesticides, and dissolved oxygen generated by ozone decomposition is present in the ozone-treated water. , These low molecular weight organic substances are easily biodegraded in the pond by the action of aerobic microorganisms. Further, in rainy weather or the like, the ozone-treated water that overflows from the pond is discharged after the activated carbon adsorption treatment, so that the removal of the pesticide is further ensured.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a flow for treating pond water in a golf course. In normal cases, such as during fine weather, a part 2 of the pond water of a pond 1 such as a scenic pond or a regulating pond in a golf course is taken out and subjected to coagulation sedimentation 3 and the aggregate 4 is filtered to remove the sediment. After that, the filtrate 6 is subjected to ozone treatment 7, and the treated water 8 is returned to the pond 1 again. At this time, the suspended matter in the water is filtered 5
Helped maintain the landscape of the pond. Further, in the treated water 8, the pesticide is oxidatively decomposed by ozone treatment to be converted into a low molecular weight organic substance, and dissolved oxygen generated by the decomposition of ozone is present. When the treated water 8 is returned, low molecular weight organic substances and BOD etc. flowing into the pond are easily biodegraded in the pond 1 by the action of aerobic microorganisms, and the pollution load to the next treatment step is significantly reduced. The amount of treated water per day is appropriately about 1/3 to 1/10 of the amount of pond water. When an aeration device is installed in the pond, low molecular weight organic substances, BOD, etc. are more efficiently oxidatively decomposed.

When the pond water overflows, such as in rainy weather, the ozone-treated water 9 for that portion is further subjected to activated carbon adsorption treatment 10, and then the treated water 11 is discharged to the outside of the golf course. This treatment ensures pesticide removal.

[0010]

As described above, according to the present invention, pesticides are oxidatively decomposed and removed by ozone treatment, and the treated water is returned to the pond. Therefore, the ozone treatment improves biodegradability more than the original pesticides. Water containing quality low-molecular weight organic matter and dissolved oxygen generated by decomposition of ozone will be returned to the pond, and the low-molecular weight organic matter and BOD flowing into the pond can be easily converted into organisms by the action of aerobic microorganisms. Be disassembled. Therefore, water-bloom etc. in the pond water are also decomposed and removed, which leads to the preservation of the landscape of the pond water. Further, in rainy weather or the like, the ozone-treated water that overflows is further subjected to activated carbon adsorption treatment, so that the pesticides in the water discharged outside the golf course can be reliably removed.

[Brief description of drawings]

FIG. 1 is a flowchart showing a water treatment method according to an embodiment of the present invention.

[Explanation of symbols]

 1 Pond 2 Pond water 8 Treated water 9 Ozone treated water 11 Treated water

Claims (1)

[Claims] 1. In a water treatment method for pond water such as a golf course scenic pond and a regulating pond, the pond water is usually pretreated by coagulation sedimentation and filtration, if necessary, and then treated with ozone. When the treated water is returned to the pond and the pond water level rises above the standard water level, such as in rainy weather, the ozone treated water that overflows from the pond is further treated by adsorption of activated carbon and then the treated water is discharged to the outside of the pond. A water treatment method characterized by: